Question: Who has kids by Gustav Holst, whose year of birth is 1907-4-12?
Paraphrase: Who's got children from Gustav Holst, whose birth year is 1907-4-12?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q200867 wdt:P40 ?answer . ?answer wdt:P569 ?x FILTER(contains(YEAR(?x),'1907'))}
Answer: Imogen Holst